Volcano and earthquake activity in Iceland
Today (9-November-2022) at 13:34 UTC an earthquake with magnitude of Mw3,2 took place in Hengill volcano. This earthquake was felt in Hveragerði town and in Reykjavík. Few smaller earthquakes followed the larger earthquake.
It looks like this earthquake swarm is over or close to end. I don’t expect anything major to happen in this earthquake activity.
Since yesterday (06-October-2022) the earthquake activity has been increasing in the volcanoes Fagradalsfjall and Reykjanes volcanoes. Please note that Global Volcanism Program has updated the informations regarding Fagradalsfjall mountain and now classifies it as its own volcano, this is after a new report and information from Icelandic Met Office. From now on I am going to use that classification when updating on activity in Fagradalsfjall volcano. I’ll not update older articles (too much work), but this also applies to them as such.
This also means that Fagradalsfjall is a new volcano in Iceland.
Earthquake activity at start of an eruption cycle in Fagraldsfjall volcano are not large. They grow larger once magma has started to push into the crust, until then the earthquake activity only seems to happens with minor earthquake swarms.
Article updated with new information.
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Today (20-May-2022) around 18:00 UTC the earthquake activity off the coast of Reykjanestá, that is part of Reykjanes volcano, increased again after few days of little earthquake activity. The earthquake swarm is ongoing and always changing so this article is going to be short because of that.
Largest earthquake so far had a magnitude of Mw3,8 and the second largest earthquake had a magnitude of Mw3,5. The Mw3,8 earthquake was felt in Grindavík and on nearby towns on Reykjanes peninsula. A Mw3,0 earthquake took place just north of Grindavík and was felt in the town.
At 03:17 UTC on 26-November-2021 an earthquake with magnitude of Mw3,5 took place in Vatnafjöll mountains that are south of Hekla volcano. This earthquake was not felt or it was not reported to Icelandic Met Office.
Continue reading “Earthquake in Vatnafjöll mountain during the night”
Yesterday (20-November-2021) an large earthquake swarm started in Reykjanes volcano. This earthquake swarm is rather large, with 217 earthquakes recorded so far. Largest earthquake had a magnitude of Mw3,5 but other earthquakes have been smaller in magnitude.
Continue reading “Large earthquake swarm in Reykjanes volcano”
Yesterday (18-November-2021 and on 17-November-2021) an earthquake swarm took place in Brennisteinsfjöll volcano. Two of the largest earthquakes where Mw3,3 magnitude in size.
Continue reading “Earthquake activity in Brennisteinsfjölll volcano”
According to a news report today (16-November-2021) inflation has been detected deep under Fagradalsfjall mountain, that is part of Krýsuvík-Trölladyngja volcano system. This inflation suggests that an eruption might start again in Fagradalsfjall mountain, it remains impossible to know when such an eruption might start. Since there is a lot that suggest this inflation is because of magma collecting at depth under Fagradalsfjall mountain. When or if that results in a eruption in the future is impossible to know.
This inflation is now large enough to be seen on satellite images that monitors deformation in the upper crust. In the upper crust this deformation appears small, but that is not all the story in this.
Icelandic News (in Icelandic)
Gosið enn í dvala – Mæla litlar hreyfingar á miklu dýpi (Rúv.is)
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Yesterday (13-November-2021) at 23:23 UTC an earthquake with magnitude of Mw3,4 took place in Vatnafjöll mountain south of Hekla volcano. This looks like an aftershock of the main earthquake of magnitude Mw5,2 that took place on 11-November-2021.
Continue reading “Strong aftershock in Vatnafjöll mountains (south of Hekla volcano)”
Today (12-November-2021) at 15:16 and 15:35 two earthquakes with magnitudes of Mw3,3 and Mw3,6 took place in Bárðarbunga volcano.
Continue reading “Two strong earthquakes in Bárðarbunga volcano”
The earthquake today (11-November-2021) at 13:21 UTC with the magnitude of Mw5,2 seems to align it self with faults that are part of SISZ rather than being part of Hekla volcano system. The high frequency tone on 2 – 4Hz that I did see on few nearby SIL stations has started to lower again after the main earthquake. Earthquake activity in the area is currently dropping but it might increase again without warning.
Continue reading “Update on the Mw5,2 earthquake south of Hekla volcano”